I would like to test on my system if the database is down with Spring Boot. I have written a rest call for testing. When the database is up, it return "test" which is correct result. But the database is down, it return nothing.
The Goal is to make it to return "test" even the database is down. Below is the error
2020-04-27 17:27:00.003 ERROR 9536 [] --- [pool-1-thread-1] o.s.s.s.TaskUtils$LoggingErrorHandler : Unexpected error occurred in scheduled task.
org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:450)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:378)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:137)
at org.springframework.session.jdbc.JdbcOperationsSessionRepository.cleanUpExpiredSessions(JdbcOperationsSessionRepository.java:589)
at org.springframework.session.jdbc.config.annotation.web.http.JdbcHttpSessionConfiguration.lambda$configureTasks$0(JdbcHttpSessionConfiguration.java:194)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:48)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.acquireConnectionIfNeeded(LogicalConnectionManagedImpl.java:109)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getPhysicalConnection(LogicalConnectionManagedImpl.java:136)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getConnectionForTransactionManagement(LogicalConnectionManagedImpl.java:254)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.begin(LogicalConnectionManagedImpl.java:262)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.begin(JdbcResourceLocalTransactionCoordinatorImpl.java:214)
at org.hibernate.engine.transaction.internal.TransactionImpl.begin(TransactionImpl.java:56)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:162)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:400)
... 13 common frames omitted
Caused by: java.sql.SQLTransientConnectionException: HikariCP - Connection is not available, request timed out after 60000ms.
at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:669)
at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:183)
at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:148)
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:128)
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122)
at org.hibernate.internal.NonContextualJdbcConnectionAccess.obtainConnection(NonContextualJdbcConnectionAccess.java:35)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.acquireConnectionIfNeeded(LogicalConnectionManagedImpl.java:106)
... 20 common frames omitted
Caused by: org.postgresql.util.PSQLException: Connection to X:X:X:X:xxxx refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:280)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195)
at org.postgresql.Driver.makeConnection(Driver.java:454)
at org.postgresql.Driver.connect(Driver.java:256)
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:117)
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:123)
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:365)
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:194)
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:460)
at com.zaxxer.hikari.pool.HikariPool.access$100(HikariPool.java:71)
at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:699)
at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:685)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
... 3 common frames omitted
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.postgresql.core.PGStream.<init>(PGStream.java:70)
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:91)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:192)
... 16 common frames omitted
And the test controller is in below
#RestController
public class TestController {
#GetMapping(value = "/test")
public String test() {
System.out.println("test");
return "Test";
}
}
the application.properties is like below
spring.datasource.hikari.maximumPoolSize=10
spring.datasource.hikari.idleTimeout=50000
spring.datasource.hikari.maxLifetime=2000000
spring.datasource.hikari.connectionTimeout=60000
spring.datasource.continue-on-error=true
spring.datasource.initialization-mode=never
spring.datasource.hikari.pool-name=KlmsHikariCP
spring.datasource.hikari.connection-test-query=SELECT 1
spring.datasource.hikari.initialization-fail-timeout= -1
spring.datasource.hikari.isolate-internal-queries=true
spring.datasource.hikari.allow-pool-suspension=true
spring.datasource.test-while-idle=true
spring.datasource.test-on-borrow=true
spring.datasource.test-on-return=false
spring.datasource.validation-interval=40000
spring.datasource.validation-query=SELECT 1 FROM DUAL
spring.datasource.time-between-eviction-runs-millis=5000
spring.datasource.min-evictable-idle-time-millis=5000
spring.datasource.remove-abandoned=true
spring.datasource.remove-abandoned-timeout=3
spring.datasource.log-abandoned=true
spring.datasource.log-validation-errors=true
################### Hibernate Configuration ##########################
spring.jpa.hibernate.ddl-auto=none
spring.jpa.show-sql=false
spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults=true
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
Do you mean during the startup of Spring or while the application is running?
Your RestController currently does not access the DB so I fail to see how the DB connection could result in errors and if the DB is down the controller should return "Test".
If you mean during startup you can try:
spring.datasource.continue-on-error=true
Check that the hostname and port are correct and that the postmaster
is accepting TCP/IP connections.
Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
Cause of error if Caused by: org.postgresql.util.PSQLException: Connection to X:X:X:X:xxxx refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
Please make sure the database host and port in your application.properties file are mentioned and are correct and also the database instance is up and running in mentioned host.
Related
I bootstrapped the springboot application with JHipster but I have not been able to get it start up . It says build success but won't start up on a server . There is an embedded tomcat server added to the POM.XML , what could be wrong ?
Caused by: java.lang.IllegalArgumentException: Unable to resolve Configuration with the provided Issuer of "http://localhost:9080/auth/realms/jhipster"
at org.springframework.security.oauth2.client.registration.ClientRegistrations.getBuilder(ClientRegistrations.java:221)
at org.springframework.security.oauth2.client.registration.ClientRegistrations.fromIssuerLocation(ClientRegistrations.java:145)
at org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientPropertiesRegistrationAdapter.getBuilderFromIssuerIfPossible(OAuth2ClientPropertiesRegistrationAdapter.java:83)
at org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientPropertiesRegistrationAdapter.getClientRegistration(OAuth2ClientPropertiesRegistrationAdapter.java:59)
at org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientPropertiesRegistrationAdapter.lambda$getClientRegistrations$0(OAuth2ClientPropertiesRegistrationAdapter.java:53)
at java.base/java.util.HashMap.forEach(HashMap.java:1425)
at org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientPropertiesRegistrationAdapter.getClientRegistrations(OAuth2ClientPropertiesRegistrationAdapter.java:52)
at org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientRegistrationRepositoryConfiguration.clientRegistrationRepository(OAuth2ClientRegistrationRepositoryConfiguration.java:49)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
... 118 common frames omitted
Caused by: org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://localhost:9080/auth/realms/jhipster/.well-known/openid-configuration": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:785)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:670)
at org.springframework.security.oauth2.client.registration.ClientRegistrations.lambda$oidc$0(ClientRegistrations.java:156)
at org.springframework.security.oauth2.client.registration.ClientRegistrations.getBuilder(ClientRegistrations.java:209)
... 130 common frames omitted
Caused by: java.net.ConnectException: Connection refused: connect
at java.base/sun.nio.ch.Net.connect0(Native Method)
at java.base/sun.nio.ch.Net.connect(Net.java:574)
at java.base/sun.nio.ch.Net.connect(Net.java:563)
at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:588)
at java.base/java.net.Socket.connect(Socket.java:648)
at java.base/java.net.Socket.connect(Socket.java:597)
at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:182)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:474)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:569)
at java.base/sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:341)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:362)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1261)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1194)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1082)
at java.base/sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1016)
at org.springframework.http.client.SimpleBufferingClientHttpRequest.executeInternal(SimpleBufferingClientHttpRequest.java:76)
at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48)
at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:66)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:776)
... 133 common frames omitted
Ensure that keycloak is started before running the springboot app because jhispter provides ready to use keycloak config. The app tries to reach keycloak at localhost:9080.
If you have docker and docker-compose installed you can use the provided docker-compose configuration and start keycloak via docker-compose -f src/main/docker/keycloak.yml up
If you want to start it manually you need to make sure to setup the jhipster realm in your keycloak instance.
You have to check 9080 port
Is it use by another process
You can do it by this command : netstat -aon
Then kill process by processor: taskkill -f /pid process_id
I have following configuration in application.properties:
spring.datasource.url=jdbc:postgresql://localhost:5432/demodb
spring.datasource.username=postgres
spring.datasource.password=password
spring.session.store-type=jdbc
spring.session.jdbc.initialize-schema=always
spring.jpa.show-sql=true
spring.jpa.generate-ddl=true
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect
spring.jpa.hibernate.ddl-auto=update
I want to handle database connection error gracefully and the application should not stop working due to failure of database connection.
I want the application to handle the error both during startup and after startup.
I'm getting following exception when my database is down:
Caused by: org.postgresql.util.PSQLException: Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:245) ~[postgresql-42.2.2.jar:42.2.2]
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49) ~[postgresql-42.2.2.jar:42.2.2]
...
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_172]
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) ~[na:1.8.0_172]
...
In #ControllerAdvise, I tried to handle error after startup, but the exception is not getting caught:
#ControllerAdvice
public class AppAdvise {
#ResponseBody
#ExceptionHandler(PSQLException.class)
#ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
public AppResponse psqlExceptionHandler(PSQLException ex) {
return helpers.getResponseErrorObject(ex.getMessage());
}
#ResponseBody
#ExceptionHandler(JDBCConnectionException.class)
#ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
public AppResponse psqlExceptionHandler(JDBCConnectionException ex) {
return helpers.getResponseErrorObject(ex.getMessage());
}
}
How can I handle the connection errors both at startup and after startup?
I try to start JanusGraph and I have a problem with TinkerPop gremlin server. I try both "release (0.1.1)" and "from source (0.2.0)" versions.
When I run /bin/janusgraph.sh start there is no error but I can't connect to gremlin with my application.
When I start TinkerPop version downloaded from Apache site I have no problem with connection. I think that the problem is with a config file. The Apache version uses tinkergraph-empty.properties, the JanusGraph version: janusgraph-cassandra-es-server.properties (Of course, I want to use Cassandra).
A result of executing gremlin-server.sh with Cassandra config don't return any errors but returns warnings:
718 [main] WARN org.apache.tinkerpop.gremlin.server.GremlinServer - Graph [graph] configured at [conf/gremlin-server/janusgraph-cassandra-es-server.properties] could not be instantiated and will not be available in Gremlin Server. GraphFactory message: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:82)
at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:70)
at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:104)
at org.apache.tinkerpop.gremlin.server.GraphManager.lambda$new$0(GraphManager.java:55)
at java.util.LinkedHashMap$LinkedEntrySet.forEach(LinkedHashMap.java:671)
at org.apache.tinkerpop.gremlin.server.GraphManager.<init>(GraphManager.java:53)
at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:83)
at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:110)
at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:344)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:78)
... 8 more
Caused by: java.lang.IllegalArgumentException: Could not instantiate implementation: org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager
at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:69)
at org.janusgraph.diskstorage.Backend.getImplementationClass(Backend.java:477)
at org.janusgraph.diskstorage.Backend.getStorageManager(Backend.java:409)
at org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1353)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:107)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:87)
... 13 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:58)
... 18 more
Caused by: org.janusgraph.diskstorage.TemporaryBackendException: Temporary failure in storage backend
at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.getCassandraPartitioner(CassandraThriftStoreManager.java:219)
at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.<init>(CassandraThriftStoreManager.java:198)
... 23 more
Caused by: org.apache.thrift.transport.TTransportException: java.net.ConnectException: Connection refused (Connection refused)
at org.apache.thrift.transport.TSocket.open(TSocket.java:185)
at org.apache.thrift.transport.TFramedTransport.open(TFramedTransport.java:81)
at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeRawConnection(CTConnectionFactory.java:102)
at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeObject(CTConnectionFactory.java:66)
at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeObject(CTConnectionFactory.java:35)
at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:1220)
at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.getCassandraPartitioner(CassandraThriftStoreManager.java:216)
... 24 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.thrift.transport.TSocket.open(TSocket.java:180)
... 30 more
How can I start JanusGraph with Cassanda without warnings?
There is a problem with starting Cassandra which you one observe by running:
bin/nodetool enablethrift
as #Ashraful Islam suggested.
One need to uncomment following line(I set address to localhost) in conf/cassandra/cassandra-env.sh :
JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=127.0.0.1"
Enable Thrift server of Cassandra
Use the below command to enable thrift in cassandra
nodetool enablethrift
I am using JPA(EclipseLink impl) in my java application. The application works find when there is no proxy configured at system level but when I configure a proxy at system level, the application fails at
EntityManager entityManager = emf.createEntityManager();
and throws the following exception
Caused by: java.net.SocketException: Unknown proxy type : null
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:395)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2137)
at java.net.Socket.connect(Socket.java:579)
... 24 more
at java.net.Socket.connect(Socket.java:528)
Caused by: java.net.SocketException: Unknown proxy type : null
at java.net.Socket.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:241)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:395)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253)
at java.net.Socket.connect(Socket.java:579)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:290)
... 25 more
at java.net.Socket.connect(Socket.java:528)
at java.net.Socket.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:241)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:290)
... 25 more
I suspect that it is trying to access mysql db at localhost via configured proxy and thus failing. But at the system level proxy configuration, I have configured the following IPs as ignored host
127.0.0.1 localhost
and using the following jdbc url
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/clharvester" />
When you are using a proxy you have to use the real IP address of the server machine to connect to the database.
I tried to connect to a remote mail server but somehow commons email/JavaMail always attempt to connect to localhost. Why???
Email email = new SimpleEmail();
email.setHostName("mailserver.com");
email.setSentDate(new Date());
email.setAuthentication("admin#mailserver.com", "password");
email.setSubject("testing using simple mail");
email.setMsg("test email");
email.setFrom("*******#gmail.com");
email.addTo("*****#gmail.com");
email.setDebug(true);
email.send();
I always get the following exceptions:
Exception in thread "main" org.apache.commons.mail.EmailException: Sending the email to the following server failed : ********:25
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1242)
at org.apache.commons.mail.Email.send(Email.java:1267)
at MyJasperService.main(MyJasperService.java:219)
Caused by: javax.mail.SendFailedException: Send failure (javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25 (java.net.ConnectException: Connection refused: connect))
at javax.mail.Transport.send(Transport.java:163)
at javax.mail.Transport.send(Transport.java:48)
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1232)
... 2 more
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25 (java.net.ConnectException: Connection refused: connect)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
at javax.mail.Service.connect(Service.java:254)
at javax.mail.Service.connect(Service.java:85)
at javax.mail.Service.connect(Service.java:70)
at javax.mail.Transport.send(Transport.java:94)
... 4 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:69)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:337)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:198)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:157)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:288)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)
... 9 more
I seem to remember that there was a problem in one of the javamail releases from Sun/Oracle.
Which version of javamail (i.e. mail.jar) and which version of commons-email are you using?
Maybe it works if you upgrade to the latest version of both.